Hey guys, I'm hoping someone can maybe give me a little insight on this issue before I take it to my dealer, or if its something I should even be worried about.

I have a 2013 Ecoboost Fx4, Sometimes when I am going and hit the gas about medium hard I hear a grinding noise that sounds almost like a train horn. Its not as loud as a train horn, But the first two times It happened I honestly thought someone was honking at me with one, except It has happened two more times at night with no other cars on the road. I'm honestly not sure how to explain the noise as its completely random, just SOMETIMES it will make the noise at around 35 mph when the gas is hit with about medium pressure. The truck has right at about 7k on it.

If anyone has had this issue or knows anything about it, Any help would be appreciated.

Thanks.